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Message-Id: <20100108141654.C13E.A69D9226@jp.fujitsu.com>
Date: Fri, 8 Jan 2010 14:30:30 +0900 (JST)
From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To: Minchan Kim <minchan.kim@...il.com>
Cc: kosaki.motohiro@...fujitsu.com,
Andrew Morton <akpm@...ux-foundation.org>,
Mel Gorman <mel@....ul.ie>, Rik van Riel <riel@...hat.com>,
linux-mm <linux-mm@...ck.org>,
lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -mmotm-2010-01-06-14-34] check high watermark after shrink zone
> Kswapd check that zone have enough free by zone_water_mark.
> If any zone doesn't have enough page, it set all_zones_ok to zero.
> all_zone_ok makes kswapd retry not sleeping.
>
> I think the watermark check before shrink zone is pointless.
> Kswapd try to shrink zone then the check is meaningul.
probably s/meaningul/meaningful/ ?
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
>
> This patch move the check after shrink zone.
> Signed-off-by: Minchan Kim <minchan.kim@...il.com>
> CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> CC: Mel Gorman <mel@....ul.ie>
> CC: Rik van Riel <riel@...hat.com>
> ---
> mm/vmscan.c | 21 +++++++++++----------
> 1 files changed, 11 insertions(+), 10 deletions(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 885207a..b81adf8 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -2057,9 +2057,6 @@ loop_again:
> priority != DEF_PRIORITY)
> continue;
>
> - if (!zone_watermark_ok(zone, order,
> - high_wmark_pages(zone), end_zone, 0))
> - all_zones_ok = 0;
> temp_priority[i] = priority;
> sc.nr_scanned = 0;
> note_zone_scanning_priority(zone, priority);
> @@ -2099,13 +2096,17 @@ loop_again:
> total_scanned > sc.nr_reclaimed + sc.nr_reclaimed / 2)
> sc.may_writepage = 1;
>
> - /*
> - * We are still under min water mark. it mean we have
> - * GFP_ATOMIC allocation failure risk. Hurry up!
> - */
> - if (!zone_watermark_ok(zone, order, min_wmark_pages(zone),
> - end_zone, 0))
> - has_under_min_watermark_zone = 1;
> + if (!zone_watermark_ok(zone, order,
> + high_wmark_pages(zone), end_zone, 0)) {
> + all_zones_ok = 0;
> + /*
> + * We are still under min water mark. it mean we have
> + * GFP_ATOMIC allocation failure risk. Hurry up!
> + */
> + if (!zone_watermark_ok(zone, order, min_wmark_pages(zone),
> + end_zone, 0))
> + has_under_min_watermark_zone = 1;
> + }
>
--
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